package socket;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;

public class Server2 {
    private ServerSocket serverSocket;
    public Server2() {
        try {
            System.out.println("正在启用服务端");
            serverSocket = new ServerSocket(8088);
            System.out.println("服务端启用完毕!");

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void start(){
        /**
         ServerSocket提供的重要方法:
         Socket accept();
         用于接收客户端的连接,并返回一个Socket实例与连接的客户端交互
         该方法是一个阻塞方法,调用后程序会一直运行,直到客户连接成功为止
         */

        try {
            while (true) {
                Socket socket = serverSocket.accept();
                System.out.println("一个客户连接成功");
                //启动一个线程负责与该客户端交互
                ClientHandler handler = new ClientHandler(socket);
                Thread t = new Thread(handler);
                t.start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Server2 server2 = new Server2();
        server2.start();
    }

    /**
     * 该线程任务负责与指定的客户端交互
     */
    private class ClientHandler implements Runnable{
        private Socket socket;
        private String host;//记录该客户的ip地址

        public ClientHandler(Socket socket){
            this.socket = socket;
            //通过sockst获取远端计算机的IP地址的字符串格式
            host = socket.getInetAddress().getHostAddress();
        }
        public void run() {
            try {
                InputStream in = socket.getInputStream();//低级流
                InputStreamReader isr = new InputStreamReader(in, StandardCharsets.UTF_8);
                BufferedReader br = new BufferedReader(isr);

                String message;
                while ((message= br.readLine())!=null){
                    System.out.println(host+"说:"+message);
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}
